What's more impressive: a proposed engine that could power neighborhoods (and even individual residences) or one that could potentially take us to the stars?

The answer isn't as simple as you might think. Engine technology is closely related to technology for producing energy -- both will have a huge impact on what we are able to do in the near and not-so-near future.

Hosts Phil Bowermaster and Stephen Gordon discuss the two headline-making engine developments mentioned above and also look into some intriguing new energy sources: stacking solar cells or drawing energy from the tides, 

Tune in and explore.